Thanks for the tip to google. I've received a message from WordPress Support that says the following:I see that you have the Custom CSS upgrade, so you can style the tag line by adding CSS.

This might be a simple question. The link you gave above says to do the following:

font-weight: bold;

I put that in the tagline, and it didn't make anything bold. I'm wondering if I need to "close" the instruction (like you do in HTML). Do you know? The instructions didn't say anything further, so I'm at a loss right now... (I googled others and still didn't find anything helpful).